By default, all models are not for sale. You have to put them on sale yourself. If you 'Edit Model', on the top right corner of your screen, there are two checkboxes - one for 'Make Public' (which allows others to see your model, which must be checked because I can see them), and another marked 'For Sale', which allows you to sell your model.

Remember to set your markups as well! (the markup editor is just below those checkboxes)

EDIT: Just looked at your shop, and clearly you're not new at this - is it perhaps a bug you're experiencing?